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Abstract

A method of producing both negative and positive copy from an electrostatic reproduction machine is described.

Country

United States

Language

English (United States)

This text was extracted from a PDF file.

This is the abbreviated version, containing approximately
86% of the total text.

Page 1 of 1

Dual Mode Electrostatic Copier

A method of producing both negative and positive copy from an electrostatic
reproduction machine is described.

A discharged-area development system normally is used to produce negative
to positive output.

To produce positive-to-positive output from this system, the photoconductor
is charged by conventional techniques to a potential V. The photoconductor is
then exposed in the normal manner, with the exception that the exposure must
be limited so that the potential in the discharged area remains at above half the
original potential. The image is then developed in conventional fashion.
However, the image is not transferred from the photoconductor, but the
photoconductor is then exposed by a suitable means, such as an erase lamp, so
that the undeveloped area of the photoconductor is discharged to near zero
potential. The toned areas of the photoconductor retain their potential because
the toner acts as a light shield. The developed image is then cleaned and the
image is then redeveloped to produce a positive copy of the original image. The
cleaning and redeveloping steps can be combined when the developer acts to
redistribute the toner such as magnetic brush development, for example.

To produce a reversed output from a charged-area development system, the
photoconductor is charged to an intermediate voltage such as above half of the
previous potential V/2. The photoconductor is then exposed using conventional
techniques and the resulta...